At work, our Boss brings her dog in on occasions. Here is the little rascal having fun with the photographer with the bright flash. All shots taken with the K10D, the FA 50mm f/1.4. The camera was set at aperture priority mode wide open. I was averaging a shutter speed of 1/180th of a second with the use of a flash.
Hehehe! Great to see. You got some good "dog @ play @ close range" shots. Not at all an easy thing to do.
I'm not sure if you ever use any post processing programs, but if you were to load the pix into one and adjust the White Balance you could get them all to have the white of the dog be white, w/o having to convert to b&w.
the dog looks like a lot of fun! Next time its running around, check the white balance setting. An animal in the office would be a big no-no around here!